Buggy code:
public class JUnitSampler extends AbstractSampler { public static final String CLASSNAME = "junitSampler.classname" ; public static final String CONSTRUCTORSTRING = "junitsampler.constructorstring" ; public static final String METHOD = "junitsampler.method" ; public static final String ERROR = "junitsampler.error" ; public static final String ERRORCODE = "junitsampler.error.code" ; public static final String FAILURE = "junitsampler.failure" ; public static final String FAILURECODE = "junitsampler.failure.code" ; public static final String SUCCESS = "junitsampler.success" ; public static final String SUCCESSCODE = "junitsampler.success.code" ; public static final String FILTER = "junitsampler.pkg.filter" ; public static final String DOSETUP = "junitsampler.exec.setup" ; public static final String APPEND_ERROR = "junitsampler.append.error" ; public static final String APPEND_EXCEPTION = "junitsampler.append.exception" ; public static final String SETUP = "setUp" ; public static final String TEARDOWN = "tearDown" ; public static final String RUNTEST = "run" ; protected Method SETUP_METHOD = null ; protected Method TDOWN_METHOD = null ; protected boolean checkStartUpTearDown = false ; protected TestCase TEST_INSTANCE = null ; private static transient Logger log = LoggingManager . getLoggerForClass ( ) ; public JUnitSampler ( ) { } public void initMethodObjects ( TestCase tc ) { } public void setClassname ( String classname ) { } public String getClassname ( ) { } public void setConstructorString ( String constr ) { } public String getConstructorString ( ) { } public String getMethod ( ) { } public void setMethod ( String methodName ) { } public String getSuccess ( ) { } public void setSuccess ( String success ) { } public String getSuccessCode ( ) { } public void setSuccessCode ( String code ) { } public String getFailure ( ) { } public void setFailure ( String fail ) { } public String getFailureCode ( ) { } public void setFailureCode ( String code ) { } public String getError ( ) { } public void setError ( String error ) { } public String getErrorCode ( ) { } public void setErrorCode ( String code ) { } public String getFilterString ( ) { } public void setFilterString ( String text ) { } public boolean getDoNotSetUpTearDown ( ) { } public void setDoNotSetUpTearDown ( boolean setup ) { } public boolean getAppendError ( ) { } public void setAppendError ( boolean error ) { } public boolean getAppendException ( ) { } public void setAppendException ( boolean exc ) { } public SampleResult sample ( Entry entry ) { SampleResult sresult = new SampleResult ( ) ; String rlabel = null ; if ( ( getConstructorString ( ) . length ( ) ) > 0 ) { rlabel = getConstructorString ( ) ; } else { rlabel = JUnitSampler . class . getName ( ) ; } <START_BUG> sresult . setSampleLabel ( rlabel ) ; <END_BUG> sresult . setSamplerData ( ( ( ( getClassname ( ) ) + "." ) + ( getMethod ( ) ) ) ) ; if ( ( this . TEST_INSTANCE ) == null ) { this . TEST_INSTANCE = ( ( TestCase ) ( JUnitSampler . getClassInstance ( getClassname ( ) , rlabel ) ) ) ; } if ( ( this . TEST_INSTANCE ) != null ) { initMethodObjects ( this . TEST_INSTANCE ) ; TestResult tr = new TestResult ( ) ; this . TEST_INSTANCE . setName ( getMethod ( ) ) ; try { if ( ( ! ( getDoNotSetUpTearDown ( ) ) ) && ( ( SETUP_METHOD ) != null ) ) { try { SETUP_METHOD . invoke ( this . TEST_INSTANCE , new Class [ 0 ] ) ; } catch ( InvocationTargetException e ) { tr . addFailure ( this . TEST_INSTANCE , new AssertionFailedError ( e . getMessage ( ) ) ) ; } catch ( IllegalAccessException e ) { tr . addFailure ( this . TEST_INSTANCE , new AssertionFailedError ( e . getMessage ( ) ) ) ; } catch ( IllegalArgumentException e ) { tr . addFailure ( this . TEST_INSTANCE , new AssertionFailedError ( e . getMessage ( ) ) ) ; } } final Method m = getMethod ( this . TEST_INSTANCE , getMethod ( ) ) ; final TestCase theClazz = this . TEST_INSTANCE ; tr . startTest ( this . TEST_INSTANCE ) ; sresult . sampleStart ( ) ; Protectable p = new Protectable ( ) { public void protect ( ) throws Throwable { m . invoke ( theClazz , new Class [ 0 ] ) ; } } ; tr . runProtected ( theClazz , p ) ; tr . endTest ( this . TEST_INSTANCE ) ; sresult . sampleEnd ( ) ; if ( ( ! ( getDoNotSetUpTearDown ( ) ) ) && ( ( TDOWN_METHOD ) != null ) ) { TDOWN_METHOD . invoke ( TEST_INSTANCE , new Class [ 0 ] ) ; } } catch ( InvocationTargetException e ) { sresult . setResponseCode ( getErrorCode ( ) ) ; sresult . setResponseMessage ( getError ( ) ) ; sresult . setResponseData ( e . getMessage ( ) . getBytes ( ) ) ; sresult . setSuccessful ( false ) ; } catch ( IllegalAccessException e ) { sresult . setResponseCode ( getErrorCode ( ) ) ; sresult . setResponseMessage ( getError ( ) ) ; sresult . setResponseData ( e . getMessage ( ) . getBytes ( ) ) ; sresult . setSuccessful ( false ) ; } catch ( ComparisonFailure e ) { sresult . setResponseCode ( getErrorCode ( ) ) ; sresult . setResponseMessage ( getError ( ) ) ; sresult . setResponseData ( e . getMessage ( ) . getBytes ( ) ) ; sresult . setSuccessful ( false ) ; } catch ( IllegalArgumentException e ) { sresult . setResponseCode ( getErrorCode ( ) ) ; sresult . setResponseMessage ( getError ( ) ) ; sresult . setResponseData ( e . getMessage ( ) . getBytes ( ) ) ; sresult . setSuccessful ( false ) ; }

Fix:
sresult . setSampleLabel ( getName ( ) ) ;